9724321166909 has 4 divisors (see below), whose sum is σ = 9724347369660. Its totient is φ = 9724294964160.

The previous prime is 9724321166837. The next prime is 9724321166993. The reversal of 9724321166909 is 9096611234279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 381040771225 + 9343280395684 = 617285^2 + 3056678^2 .

It is a cyclic number.

It is not a de Polignac number, because 9724321166909 - 2²⁰ = 9724320118333 is a prime.

It is a super-2 number, since 2×9724321166909² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9724321166509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12536582 + ... + 13289639.

It is an arithmetic number, because the mean of its divisors is an integer number (2431086842415).

Almost surely, 2^{9724321166909} is an apocalyptic number.

It is an amenable number.

9724321166909 is a deficient number, since it is larger than the sum of its proper divisors (26202751).

9724321166909 is a wasteful number, since it uses less digits than its factorization.

9724321166909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26202750.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 9724321166909 in words is "nine trillion, seven hundred twenty-four billion, three hundred twenty-one million, one hundred sixty-six thousand, nine hundred nine".